/*
 * Java Trust Project.
 * Copyright (C) 2009 FedICT.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version
 * 3.0 as published by the Free Software Foundation.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, see 
 * http://www.gnu.org/licenses/.
 */

package be.fedict.trust.crl;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.ByteArrayInputStream;
import java.net.URI;
import java.security.NoSuchProviderException;
import java.security.cert.*;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;

/**
 * Off line CRL repository. This implementation receives a list of
 * {@link X509CRL} objects.
 *
 * @author wvdhaute
 */
public class OfflineCrlRepository implements CrlRepository {

    private static final Log LOG = LogFactory
            .getLog(OfflineCrlRepository.class);

    private final List<X509CRL> crls;

    /**
     * Main constructor
     *
     * @param encodedCrls the list of encoded CRL's that can be queried.
     * @throws NoSuchProviderException
     * @throws CertificateException
     * @throws CRLException
     */
    public OfflineCrlRepository(List<byte[]> encodedCrls)
            throws CertificateException, NoSuchProviderException, CRLException {

        CertificateFactory certificateFactory = CertificateFactory.getInstance(
                "X.509", "BC");
        this.crls = new LinkedList<X509CRL>();
        for (byte[] encodedCrl : encodedCrls) {
            ByteArrayInputStream bais = new ByteArrayInputStream(encodedCrl);
            this.crls.add((X509CRL) certificateFactory.generateCRL(bais));
        }
    }

    /**
     * {@inheritDoc}
     */
    public X509CRL findCrl(URI crlUri, X509Certificate issuerCertificate,
                           Date validationDate) {

        for (X509CRL crl : this.crls) {
            if (crl.getIssuerX500Principal().equals(
                    issuerCertificate.getSubjectX500Principal())) {
                LOG.debug("CRL found for issuer "
                        + issuerCertificate.getSubjectX500Principal()
                        .toString());
                return crl;
            }
        }

        LOG.debug("CRL not found for issuer "
                + issuerCertificate.getSubjectX500Principal().toString());
		return null;
	}
}
